CN1645861A - Flexible exchanging network method for passing fire wall - Google Patents
Flexible exchanging network method for passing fire wall Download PDFInfo
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- CN1645861A CN1645861A CNA2005100181775A CN200510018177A CN1645861A CN 1645861 A CN1645861 A CN 1645861A CN A2005100181775 A CNA2005100181775 A CN A2005100181775A CN 200510018177 A CN200510018177 A CN 200510018177A CN 1645861 A CN1645861 A CN 1645861A
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Abstract
The method includes following steps: through adding a media proxy server, the media data communicating between terminals is retransmitted by the media proxy server that interacts with soft exchange controller to complete the dialog; in the process of call establish, the soft exchange controller and media proxy server both can automatically collect IP address conversed by address of fire wall, and transmit the data package according to conversed address.
Description
Technical field
The present invention relates to the method for a kind of soft exchange network passing through firewall in the network communication field, specifically, relate to a kind of media proxy server and soft switch controller.
Background technology
Network address translation (Network Address Translation, be called for short NAT) be the standard method that is used for an address field such as company intranet are mapped to another address field such as internet, main frame use private net address in private network of its permission is connected to the main frame in the PD, and need not to have public network address, it can alleviate the situation of present 32 long IPv4 (referring to the network based on IP the 4th edition) address resource exhaustion.On the other hand, for improving internet security, the fire compartment wall (Firewall that most enterprises dispose in the exit, be called for short FW), great majority are used address translation feature and fire compartment wall are integrated on the equipment, guarantee the safety in the private network, security strategy is provided, stops outside attack.General its security strategy is to allow internal user initiatively to visit the outside, and the active connection of external user then is not allowed to.This may make both sides when communication, and the private network internal user can only be as caller, can not do calledly, removes the visit of non-firewall opening to all internal users, has lost its this basic role of shielding protection as internal resource so again.
In the architectural framework of next generation network (Next Generation Network is called for short NGN), soft switch (SoftSwitch) then is a decisive solution that merges speech, data, fax and video traffic.Before IPv6 (the IP standard of a new generation) technology extensive use, the NAT that soft switchcall server still need solve between soft switch control appliance and the terminal equipment passes through and the fire compartment wall penetration problem.Although the packet that the equipment in the private network sends has carried out the address transition of private network to public network, and this transformational relation generally is to finish by the address in IP packet header is revised, the soft switch control appliance on upper strata and terminal are not also known, because the agreements such as voice and video of IP Packet Based Network carrying, its Media Stream call address are determined after by the signaling protocol dynamic negotiation.The private net address of unconverted, can not be on public network route, thereby can't set up communication.Therefore have now by this type of enterprise customer and broadband user who does not support the firewall box of soft switch agreement to insert public network and be difficult to actual commencing business.
Summary of the invention
The method that the purpose of this invention is to provide a kind of soft switch passing fire wall promptly under the situation of not revising fire compartment wall and terminal equipment, can make soft switch and terminal equipment successfully set up calling.
The object of the present invention is achieved like this:
Introduce new functional entity at the flexible exchanging network local side, this entity is called media proxy server (MediaProxy, be called for short MP) 1, be connected on the media proxy server 1 by calling two terminals, transmit Media Stream by media proxy server 1 and realize the penetrate firewall wall function.By increasing media proxy server 1, by 2 its work of control of soft switch controller, make calling between the terminal become calling between terminal and the media proxy server 1, and the information interchange between the media proxy server 1 coordination terminal.In call establishment, soft switch controller 2 and media proxy server 1 automatically acquisition terminal by the IP address after the NAT conversion, and the address transmission of packet that can be subsequently after by conversion.The invention solves the problem of soft switch firewall-penetrating, and whole process all adopts standard soft switch agreement, terminal and fire compartment wall are not all had specific (special) requirements.
The concrete steps of below operation principle, the network of media proxy server 1 and soft switch controller 2 being formed and being realized are narrated successively.
Described media proxy server (1) is the forwarding unit that is exclusively used in voice, video, fax-traffic, data channel according to session association, the replacement that receives respectively and send for the Media Stream of communication two party, receive that promptly the Media Stream that caller is sent transfers to called immediately, receive that called data also are given to the calling party immediately, real-time tranception is also synchronous with session, during conversation end, forwarding behavior in this passage also stops, related passage is also removed thereupon, thereby realizes the medium intercommunication of terminal in the complicated flexible exchanging network environment.
Media proxy server (1) function realizes, can be the Media proxy program on the operation workstation operating system.Media proxy server 1 is mainly by three logic modules: media management module, channel management module and data forwarding module are formed.Calling in media management module and the soft switch controller 2 control is mutual, and whether the decision conversation media through the transfer agency, and to the parsing of concrete load, realizes the control of medium trend.The channel management module then is responsible for distribution, monitoring, the release of the required media channel of session, and does traffic statistics when session is finished.Data forwarding module is then pressed assigned source passage and purpose passage, the media data packet that the forwarding communication two party of real-time high-efficiency sends.Three modules are finished the medium forwarding work of session thus.Concrete operating efficiency then can be according to hardware platform performance, the access bandwidth of media proxy server 1, and simultaneously treated calls and agency's medium type estimates, and can reach designing requirement and practical requirement fully.
Described soft switch controller (2) is based on the distributed exchange and the controlling platform of software; CCF is separated from conventional gateway, the agreement between open service, control, access and exchange, thus really realize many Virtual network operators, and can introduce multiple business easily; At passing through of fire compartment wall, the interactive module of increase and media proxy server (1), after completing successfully signalling interworking, session foundation in the private network, realization is controlled the flow direction of the media data that both sides send.
Soft switch controller (2) can be for the foundation of basic call, keep and release provides controlled function, comprises call treatment, connects control, intelligent call triggers and detect with resource control etc.The network architecture that it is open, the agreement support that the calling that possesses control, transmission control, medium control, service application, maintenance management etc. are enriched makes up the core of next generation network jointly with the core-application server that provides, develops and manage as business.
For realizing mutual with media proxy server, in CCF, soft switch controller 2 should be apprised of the position in network of calling both sides terminal, and can H.248, revise medium among the SDP (being Session Description Protocol) of MGCP, SIP medium control protocol and send and receiver address, simultaneously with media proxy server 1 in media management module mutual, and then reach the control conversation media and move towards this crucial purpose.
Its network is formed, and as shown in Figure 1, the present networks system is made up of private network A, IP backbone B, PSTN public switched telephone network (PSTN) C, is communicated with by Packet Based Network switching equipment 8, Tandem Gateway 9; Described private network A is made up of firewall box 3, LAN switch 4, IP phone 5, IAD integrated access equipment 6, common phone 7.
In IP backbone B, be provided with media proxy server 1 and soft switch controller 2; Media proxy server 1, soft switch controller 2, Packet Based Network switching equipment 8 are interconnected.
The present invention specifically has the following step:
1. communicating terminal connects soft switching server 2 by registration or status report, soft switch controller 2 and then can determine its position;
2. by soft switch controller 2, the foundation of terminal completing call signaling, media proxy server 1 is ready to the media data passage simultaneously, the transmitting-receiving transfer of beginning Media Stream;
3. required data channel during media proxy server 1 guarantees to call out continues to transmit medium until this time conversation end;
4. after receiving call termination notification, media proxy server (1) is closed the session related data passage, discharges resource, and the session statistical information is provided.
At above-mentioned steps, invention technical scheme content is described in detail below.
At first, register the multimedia terminal, sets up a passage from the multimedia terminal to the controller.Because the NAT processing unit of fire compartment wall has certain lifetime to the conversational list of private net address and public network address, when not having data packet transceive in the certain hour, fire compartment wall will be cancelled this unique corresponding relation.So need this passage of soft switch controller 1 periodic refreshing, the mode that refreshes is to keep regularly sending data between soft switch controller and the terminal, as some and the irrelevant query messages of calling.This signalling path will provide the control of voice to the multimedia terminal, video, file, data medium transmission channel.
Simultaneously, the packet that equipment sends in the fire compartment wall is after having passed through one or more firewall boxs, the address that comprises in the protocol package is a non-routable private net address, so can not be when sending response packet with this address response, but with its arrive controller the address of last firewall box of process respond.By contain in the packet that arrives as user ID or email registered information, this moment, controller was safeguarded an address mapping table, the terminal that all finish the registration checking is able to unique difference and location by this correspondence table.Like this for soft switchcall server, can think to be exactly that the terminal of address shown in this table has been finished registration, be ready to can initiate and call accepted, terminal itself needn't be concerned about to have passed through what firewall boxs on the path of call setup.
Next step, after communication two party all guaranteed signalling path, both sides can prepare communication.Wherein a side makes a call to the soft switch controller as caller, and controller is resolved destination address, makes a call to the opposing party.After the other side replied, the soft switch controller all was connected to media proxy server with two sides, and notified it to call out and set up, control it and open passage, prepare the buffering area of data transmit-receive, allow it start an independent processing unit simultaneously, to finish all Media Stream connection work of this session.H.248 or the description of pair terminal capabilities set all arranged in Megaco, MGCP, the H323 agreement soft switch agreement such as SIP,, the negotiation of its decision Media Stream and set up process.The distribution of concrete Media Stream transmitting-receiving address and port, and the analysis modify work of load is then finished by the soft switch controller.For example, data flow transmission such as speech, video related protocol is RTP RTP and RTCP control protocol, Control Allocation RTP and RTCP address are to the address of accepting as call-originating end, avoided any distribution of outlet NAT to RTP/RTCP address port number, the RTCP message that makes a side can't receive the other side to send (when the RTCP message is sent out in the opposite end, the destination slogan is default adds 1 send) by the RTP port numbers.Communication therebetween in the Media Stream dtmf signal also can send and be for further processing via media proxy server.
At this moment, the communication two party terminal of complete connection under Media Stream is constantly transmitted via media proxy server 1, is able to normal communication, to the last takes out stitches.The necessary related both sides of the processing unit of media proxy server 1, and the state of monitoring media stream are to controller reporting.Media Stream goes wrong in connecting, or medium consultation process is inconsistent with actual work, must feed back to controller, so that stop session.
At last when conversation end, soft switch controller 2 notice media proxy servers 1, receive indication after, media proxy server 1 stops receiving-transmitting sides terminal media stream, close all data channel that session is used, discharge the relevant resource of session and be connected, the traffic statistics of public lecture simultaneously meter information.
At the terminal of communication two party in the network the position that might be in, technical solution of the present invention has also been done careful consideration.When the end of communication two party in public network or same private network, or be positioned at different port on the integrated access equipment (be called for short IAD), soft switch controller 2 is clearly known this point when it is registered, thereby when connecting Media Stream, can control it without media proxy server 1, promptly do the accommodation on the forwarding strategy, reduce the load of Media proxy, reduce the network bandwidth and use, improve communication quality.This optimization in the private network of special communication between those are based on terminal, has significant effect.
In the actual networking, soft switch controller 2 also is deployed on the private network A sometimes, and this scheme usually is applied to have more private network resource, to the security requirement condition with higher.When soft switch controller 2 is positioned at private network A, then need the equipment of an ALG or similar functions to cooperate with it.As the trusted device of soft switch controller 2, it acts on behalf of public network to the passing through of private network, and guarantees and is in mutual between the Media proxy of public network, finishes the communication between the multimedia terminal in such cases jointly.
Above step has been described the communication modes that the technical program proposed under the various complex network situations.
At present, the Firewall Traversing scheme or the application of multimedia service in the existing next generation network of many tame equipment suppliers, the present invention program is taking all factors into consideration networking flexibility, use extensibility, to what propose after the factors such as existing equipment transformation, resource management, network security, be applied between enterprises, enterprise and the enterprise with more branch, have good effect.
The present invention has the following advantages and good effect:
1, support standard soft switch agreement, terminal equipment is not proposed extra demand, the terminal in the fire compartment wall both can be used as caller and also can do called.
2, can pass through multilevel firewalls equipment, scheme is not destroyed the fail safe of its original structure, and resource information is well shielded in the private network.
3, system deployment is very flexible.Core act on behalf of this module of medium, use the various control strategy, take into account variety of network environments.As a logical block, it can be integrated on the physical equipment with the soft switch controller, also can be separately on distinct device.Dispose the business that does not also influence after this system in the former network, can support the application such as audio frequency, video, fax of regulation in " Softswitch general technical standard ".
Communication quality when 4, the cluster mode of load balancing guarantees high traffic.For example in this locality or the strange land a plurality of media proxy servers are set, can reduce the time delay or the packet loss problem that cause because of server performance and bandwidth to greatest extent, thereby this scheme is fit to the high-performance support system of large-scale telecom operators fully.
5, cross-platform design and realization can run on Linux, the Unix or Win32 operating system of main flow, and the user selects different system platforms according to different level of securitys or instructions for use.
Description of drawings
Fig. 1-embodiment of the present invention schematic diagram.
Wherein:
The 1-media proxy server;
2-soft switch controller;
The 3-firewall box;
The 4-LAN switch;
The 5-IP phone;
The 6-IAD integrated access equipment;
The 7-common phone;
8-Packet Based Network switching equipment;
The 9-Tandem Gateway;
A-private network: A1-first private network, A2-second private network;
The B-IP backbone network;
The C-PSTN public switched telephone network (PSTN);
The a-signaling data channel;
B-media data passage;
C-control data passage, mutual in order to the control of finishing between media proxy server and the soft switch controller.
Embodiment
* by standard soft switch agreement or SIP, H.248 or Megaco, MGCP finish Media Stream and be forwarded to media proxy server 1, soft switch controller 2 support meets soft switch SIP, H.248 or the multimedia terminal of Megaco, MGCP standard, supports on the medium type but is not limited to voice, video, fax-traffic.
* soft switch controller 2 can be positioned at public network, also can be positioned at private network; Coordinate, control whole session between soft switch controller 2 and the Media proxy mutually, and can do optimization on the strategy, finish the communication of multimedia terminal under the various complex network environments jointly according to the terminal particular location.
* in conjunction with the call flow of concrete agreement
1, caller and called terminal can begin to send register requirement after connecting private network, and message is passed the fire compartment wall of place private network respectively via signaling data channel, arrive at soft switch controller 2.Soft switch controller 2 control terminals regularly use this passage, guarantee that this signaling control channel can be maintained during whole session.Record the fire compartment wall public network side address of last process in the packet of arrival soft switch controller 2, checking is by the Subscriber Number of promising its distribution in back, and these make the terminal of communication two party have routable public network address and orientable number.
When 2, caller makes a call, soft switch controller 2 finds called, notify media proxy server 1 Control Allocation two passages on the one hand, the Media Stream that related respectively good caller is called and preparation reception both sides send, on the other hand, after consulting capability set success each other,, be packaged in the associated description agreement and issue the other side the channel address that media proxy server 1 is distributed.
3, by the control data passage, media proxy server 1 and soft switch controller 2 are coordinated mutually, act on whole calling procedure.Process relates to be set up and the control media channel, distributes RTP/RTCP port address equity.Media proxy server 1 constantly carries out the forwarding of Media Stream via the media data passage, until conversation end.
When 4, soft switch controller 2 is found side's on-hook, notify the other side, close on the media proxy server 1 media channel simultaneously with this session association.So far, the access success of a pass through private net A is finished.
More than illustrated in the typical flexible exchanging network, used the present embodiment,, successfully realized two terminal calleds that are in different private network A by the middle rotating function of media proxy server 1.
Claims (3)
1, a kind of method of soft exchange network passing through firewall comprises network system, and this network system is made up of private network (A), IP backbone (B), PSTN public switched telephone network (PSTN) (C), is communicated with by Packet Based Network switching equipment (8), Tandem Gateway (9); Described private network (A) by firewall box (3), LAN switch (4), IP phone (5), comprehensively insert IAD equipment (6), common phone (7) is formed;
It is characterized in that: in IP backbone (B), be provided with media proxy server (1) and soft switch controller (2); Media proxy server (1), soft switch controller (2), Packet Based Network switching equipment (8) are interconnected; Be connected on the media proxy server (1) by calling, transmit Media Stream by media proxy server (1) and realize the penetrate firewall wall function two terminals;
Described media proxy server (1) is the forwarding unit that is exclusively used in voice, video, fax-traffic, data channel according to session association, the replacement that receives respectively and send for the Media Stream of communication two party, receive that promptly the Media Stream that caller is sent transfers to called immediately, receive that called data also are given to the calling party immediately, real-time tranception is also synchronous with session, during conversation end, forwarding behavior in this passage also stops, related passage is also removed thereupon, thereby realizes the medium intercommunication of terminal in the complicated flexible exchanging network environment.
Described soft switch controller (2) is based on the distributed exchange and the controlling platform of software; CCF is separated from conventional gateway, the agreement between open service, control, access and exchange, thus really realize many Virtual network operators, and can introduce multiple business easily; At passing through of fire compartment wall, the interactive module of increase and media proxy server (1), after completing successfully signalling interworking, session foundation in the private network, realization is controlled the flow direction of the media data that both sides send.
The following step is specifically arranged:
1. communicating terminal connects soft switching server (2) by registration or status report, soft switch controller (2) and then can determine its position;
2. by soft switch controller (2), the foundation of terminal completing call signaling, media proxy server (1) is ready to the media data passage simultaneously, the transmitting-receiving transfer of beginning Media Stream;
3. required data channel during media proxy server (1) guarantees to call out continues to transmit medium until this time conversation end;
4. after receiving call termination notification, media proxy server (1) is closed the session related data passage, discharges resource, and the session statistical information is provided.
2, the method for a kind of soft switch passing fire wall according to claim 1, it is characterized in that: by standard soft switch agreement or SIP, H.248 or Megaco, MGCP finish Media Stream and be forwarded to media proxy server (1), soft switch controller 2 support meets soft switch SIP, H.248 or the multimedia terminal of Megaco, MGCP standard, supports on the medium type but is not limited to voice, video, fax-traffic.
3, according to the method for the described a kind of soft switch passing fire wall of claim 1, it is characterized in that: soft switch controller (2) can be positioned at public network, also can be positioned at private network; Coordinate, control whole session mutually between soft switch controller (2) and the media proxy server (1), and can do optimization on the strategy, finish the communication of multimedia terminal under the various complex network environments jointly according to the terminal particular location.
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| CNA2005100181775A CN1645861A (en) | 2005-01-20 | 2005-01-20 | Flexible exchanging network method for passing fire wall |
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| CNA2005100181775A CN1645861A (en) | 2005-01-20 | 2005-01-20 | Flexible exchanging network method for passing fire wall |
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| CN1645861A true CN1645861A (en) | 2005-07-27 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100442928C (en) * | 2005-10-19 | 2008-12-10 | 华为技术有限公司 | Mobile session control equipment and mobile communication network and speech path establishing method |
| CN100452769C (en) * | 2005-12-31 | 2009-01-14 | 武汉市中光通信公司 | System of soft exchange network passing through firewall based on ALG+MP and its method |
| CN100546373C (en) * | 2006-04-29 | 2009-09-30 | 华为技术有限公司 | The implementation method of dialing set in multi-medium video-signal system |
| WO2010020169A1 (en) * | 2008-08-21 | 2010-02-25 | 华为技术有限公司 | Media bypass method, system and apparatus |
| CN103888734A (en) * | 2014-03-26 | 2014-06-25 | 浙江宇视科技有限公司 | Method and device for controlling media stream under two layers of private networks |
| CN104883390A (en) * | 2015-04-17 | 2015-09-02 | 浙江宇视科技有限公司 | Method of accessing third-party video monitoring device and device of accessing third-party video monitoring device |
| CN107579963A (en) * | 2017-08-24 | 2018-01-12 | 南京南瑞集团公司 | A kind of high performance firewall cluster |
-
2005
- 2005-01-20 CN CNA2005100181775A patent/CN1645861A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100442928C (en) * | 2005-10-19 | 2008-12-10 | 华为技术有限公司 | Mobile session control equipment and mobile communication network and speech path establishing method |
| CN100452769C (en) * | 2005-12-31 | 2009-01-14 | 武汉市中光通信公司 | System of soft exchange network passing through firewall based on ALG+MP and its method |
| CN100546373C (en) * | 2006-04-29 | 2009-09-30 | 华为技术有限公司 | The implementation method of dialing set in multi-medium video-signal system |
| WO2010020169A1 (en) * | 2008-08-21 | 2010-02-25 | 华为技术有限公司 | Media bypass method, system and apparatus |
| CN103888734A (en) * | 2014-03-26 | 2014-06-25 | 浙江宇视科技有限公司 | Method and device for controlling media stream under two layers of private networks |
| CN103888734B (en) * | 2014-03-26 | 2017-08-15 | 浙江宇视科技有限公司 | Media stream control method and device under two layers of private network |
| CN104883390A (en) * | 2015-04-17 | 2015-09-02 | 浙江宇视科技有限公司 | Method of accessing third-party video monitoring device and device of accessing third-party video monitoring device |
| CN104883390B (en) * | 2015-04-17 | 2018-07-13 | 浙江宇视科技有限公司 | A kind of method and device accessing third party's video monitoring equipment |
| CN107579963A (en) * | 2017-08-24 | 2018-01-12 | 南京南瑞集团公司 | A kind of high performance firewall cluster |
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